The jitters from the event go after a few days, the effects of the buried stress/trauma will last a bit longer. -Be sure not to snap at people and be self conscious of your reactions for a while, get some exercise and have a few drinks perhaps at the end of the week. Learn from it, and know that next time you see similar events unfolding you will stop it before it gets even close to the same again! Self preservation kicks in...
Depending on the event, if it is something else, like what I have experienced once such as a student being psychologically unstable and going nuts in the air and at the controls, then some outside help to specifically discuss it would be wise.